Fugeguy,
Nederman at 1-905-795-0632 (sorry its in canada) do excellent local ventilation systems for welding and other highly fumy occupations. I have used them mostly in UK & western europe and they've not let me down yet.
These items can be made portable or with giant hose tails such as I've...
A contractor did this to me in a congested boiler room, where the actual position of the pump ( although the construction drawings showed it correctly ) went unnoticed until certification. The system like yours was un pressurised and upon start up, a low pressure system was set up in the suction...
